Kevin Mitchell: Roger Federer, Andy Murray and Serena Williams among host of grand slam winners lured to the fresh global format, which organisers hope will do for tennis what the IPL has done for cricket

Kevin Mitchell: There is a possibility that the Big Four – Nadal, Djokovic, Murray and Federer – will face off in the Wimbledon semi-finals, yet the chances of the quartet being split are probably just as high